﴿ وَنُنَزِّلُ مِنَ ٱلْقُرْءَانِ مَا هُوَ شِفَآءٌۭ وَرَحْمَةٌۭ لِّلْمُؤْمِنِينَ ۙ وَلَا يَزِيدُ ٱلظَّٰلِمِينَ إِلَّا خَسَارًۭا ﴾

“THUS, step by step, We bestow from on high through this Qur'an all that gives health [to the spirit] and is a grace unto those who believe [in Us], the while it only adds to the ruin of evildoers:”

And We reveal of min here is explicative the Qur’ān that which is a cure from error and a mercy for believers thereby; though it only increases the evildoers the disbelievers in loss because of their disbelief in it.